Use formatted captions for images and video

[jmartinesp]

Content

This PR has the following changes:

• Parse the caption and formattedCaption in the same way as we do for text messages.
• Allow opening links from the caption UI text component.
• Split the onClick action for timeline items between those whose onClick action should be triggered by the whole message bubble and those who should trigger it only from certain UI elements (as the image/video preview in the timeline).

Note there's no way to send captions as either markdown or HTML at the moment from the app, so either you send these from some other client or you'd only be able to test this by sending a URL as part of the plain text caption.

This PR can be reviewed commit-by-commit.

Motivation and context

Fixes #3850.

Screenshots / GIFs

No changes in screenshots, I hope.

Tests

• Send an image/video with an URL in the caption and some other text.
• Make sure the link in the caption is later clickable in the timeline item.
• Clicking on the image/video preview should open the viewer.
• Clicking on the text part that has no URL shouldn't do anything.
• Clicking on the URL should open it.
• Clicking on any other timeline items should have the same effect as before this patch.

Tested devices

• Physical
• Emulator
• OS version(s): 14

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

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[codecov]

Codecov Report

Attention: Patch coverage is 68.11594% with 22 lines in your changes missing coverage. Please review.

Project coverage is 82.84%. Comparing base (a9c74e9) to head (9ae4f4a).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ctories/event/TimelineItemContentMessageFactory.kt	0.00%	1 Missing and 6 partials ⚠️
...imeline/components/TimelineItemGroupedEventsRow.kt	20.00%	4 Missing ⚠️
...tures/messages/impl/timeline/model/TimelineItem.kt	40.00%	0 Missing and 3 partials ⚠️
...e/components/event/TimelineItemEventContentView.kt	77.77%	2 Missing ⚠️
...timeline/components/event/TimelineItemImageView.kt	60.00%	1 Missing and 1 partial ⚠️
...timeline/components/event/TimelineItemVideoView.kt	60.00%	1 Missing and 1 partial ⚠️
...ssages/impl/timeline/components/TimelineItemRow.kt	80.00%	0 Missing and 1 partial ⚠️
...meline/components/event/TimelineItemStickerView.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3864      +/-   ##
===========================================
- Coverage    82.86%   82.84%   -0.02%     
===========================================
  Files         1783     1783              
  Lines        44995    45014      +19     
  Branches      5302     5312      +10     
===========================================
+ Hits         37283    37294      +11     
+ Misses        5864     5861       -3     
- Partials      1848     1859      +11     

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[jmartinesp]

This is complemented by matrix-org/matrix-rust-sdk#4261, which allows generating HTML formatted body from the caption, which is now used as markdown instead of plain text.

[bmarty]

LGTM, thanks!

[cyrneko]

glad to see the fix has landed, thank you! <3